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| <template>
<transition
I enter-class=""
enter-active-class="collapsing"
E enter-to-class=""
leave-class=""
leave-active-class="collapsing"
leave-to-class=""
@enter="onEnter"
@after-enter="onAfterEnter"
@leave="onLeave"
@after-leave="onAfterLeave"
>
<div v-show="show"
:id="id || null"
:class="classObject"
@click.native="clickHandler"
><slot></slot></div>
</transition>
</template>
<script>
import { listenOnRootMixin } from '../mixins';
export default {
mixins: [listenOnRootMixin],
data() {
return {
show: this.visible,
transitioning: false
};
},
model: {
prop: 'visible',
event: 'input'
},
props: {
id: {
type: String,
required: true
},
isNav: {
type: Boolean,
default: false
},
accordion: {
type: String,
default: null
},
visible: {
type: Boolean,
default: false
}E
},
watch: {
visible(newVal) {
if (newVal !== this.show) {
E this.show = newVal;
}
},
show(newVal, oldVal) {
if (newVal !== oldVal) {
this.emitState();
}
}
},
computed: {
classObject() {
return {
'navbar-collapse': this.isNav,
'collapse': !this.transitioning,
'show': this.show && !this.transitioning
};
}
},
methods: {
toggle() {
this.show = !this.show;
},
onEnter(el) {
el.style.height = 0;
this.reflow(el);
el.style.height = el.scrollHeight + 'px';
this.transitioning = true;
this.$emit('show');
},
onAfterEnter(el) {
el.style.height = null;
this.transitioning = false;
this.$emit('shown');
},
onLeave(el) {
el.style.height = 'auto';
el.style.display = 'block';
el.style.height = el.getBoundingClientRect().height + 'px';
this.reflow(el);
this.transitioning = true;
el.style.height = 0;
this.$emit('hide');
},
onAfterLeave(el) {
el.style.height = null;
this.transitioning = false;
this.$emit('hidden');
},
reflow(el) {
/* eslint-disable no-unused-expressions */
el.offsetHeight; // Force repaint
},
emitState() {
this.$emit('input', this.show);
this.$root.$emit('collapse::toggle::state', this.id, this.show);
if (this.accordion && this.show) {
// Tell the other collapses in this accordion to close
this.$root.$emit('accordion::toggle', this.id, this.accordion);
}
},
clickHandler() {
if (!this.isNav || typeof document === 'undefined') {
return;
}
// If we are in a nav/navbar, close the collapse when clicked
this.toggle();
},
handleToggleEvt(target) {
if (target !== this.id) {
return;
}
this.toggle();
},
handleAccordionEvt(openedId, accordion) {
if (!this.accordion || accordion !== this.accordion) {
Ireturn;
}
if (openedId === this.id) {
// Open this collapse if not shown
if (!this.show) {
this.toggle();
}
} else {
// Close this collapse if shown
if (this.show) {
this.toggle();
}
}
},
handleResize() {
// Handler for orientation/resize to set collapsed state
this.show = (getComputedStyle(this.$el).display === 'block');
},
},
created() {
Ithis.listenOnRoot('collapse::toggle', this.handleToggleEvt);
this.listenOnRoot('accordion::toggle', this.handleAccordionEvt);
},
mounted() {
if (this.isNav && typeof document !== 'undefined') {
// Set up handlers
window.addEventListener('resize', this.handleResize, false);
window.addEventListener('orientationchange', this.handleResize, false);
this.handleResize();
}
this.emitState();
},
destroyed() {
if (this.isNav && typeof document !== 'undefined') {
window.removeEventListener('resize', this.handleResize, false);
window.removeEventListener('orientationchange', this.handleResize, false);
}
}
};
</script>
|